Question about Harley Davidson FLHT Electra Glide Standard Motorcycles
To test the voltage regulator, first you must have a FULLY charged battery in the bike. You'll need a good DVOM (digital volt ohm meter). Connect the DVOM across the battery, red lead to the positive post, black lead to the negative post. Put the meter's function switch in DC VOLTS, 20 VOLT range. Start the engine and bring it to a high idle. You should read 14.5 to 15.0 volts within a few seconds of starting the engine.
To check the output of the alternator, put your meter's function switch in AC VOLTS, 50 VOLT range. Follow the two wires that come from the regulator down to where they connect to the alternator either at the engine case or a plug. Disconnect the plug and look inside. You'll see two metal contacts in the alternator side of the plug. Here's where you're going to check for voltage. Start the engine, bring it to a high idle, and insert one meter lead into each contact. Since you're measuring AC voltage, it makes no difference which lead goes where. You should read at least 25 volts on a Sportster and 30 volts on a Big Twin.
If your alternator checks good but at the battery the voltage checks low. Replace the regulator.
Posted on Oct 10, 2010
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Posted on Jan 02, 2017
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